<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>边框样式</title>
		<style>
		#mydiv{
			border:1px solid red;
			width: 300px;
			height: 300px;
			/* background-color: #0000FF; */
		}
		.uname{
			width: 300px;
			height: 40px;
			/* border: 1px solid red; */
			border-top-style: double;
			border-left-style:1px solid  #0000FF;
			border-right-style: solid ;
			border-bottom-style: solid; 
		}
		</style>
	</head>
	<body>
		<div id="mydiv">
			
		</div><br />
		<input type="text" class="uname" />
	</body>
</html>
